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The prime mover for flexion of the shoulder muscles used are the following: 1  Pectoralis Major Clavicle. 2  Anterior Deltoid. 3  Biceps Brachii Short Head. 4  Coracobrachialis.
Although it may seem simple, stretching your arms over your head requires a complex, coordinated movement of your whole shoulder girdle, termed the scapulohumeral rhythm. Many muscles are involved in this action, including the rotator cuff muscles on your shoulder blade, the deltoid muscle on your outer shoulder and ...